Gearing



July 8, 1930. w. KROTEE 1,769,957

lGEARING Filed April 28, 1928 3 Sheets-Sheet 1 fWalter E; Krntee attoimuj July 8, 1930- w. E. KRo'rEE 1,769,957

GEARING Filed April 28, 1928 3 Sheets-Sheet 2 mlm Il attenua,

GEARING l Filed April 28, 1928 3 sheets-sheet 3 guoenfoz Walter E. Krntee vPatented July 8, 1930 WALTER n. nnofrnn, or rnILADnLrHIA, PENNSYLVANIA GEAniNe Application filed April 28,

iezsf serial No. 273,697.

(GRANTED UNDER THE ACT F MARCH 3, 1885?;s AS AMENDED APRIL 30, 1928; 370 0. G. 757) `The invention described herein may be manufactured and used by or for the Grovernment for governmental purposes without the payment to me of any royalty thereon.

This invention relates to gearing and more particularly it has reference to means for taking up the clearance between the gear teeth in a system of gearing.

The invention is directed to an 'arrangel0 ment wherein either the driving or driven element of the gearing is duplicated and the duplicated element is under control of a toggle mechanism.

l/Vith the foregoing and other objects in view, my invention resides in the novel arrangement and combination of parts and in the details ofconstruction hereinafter described and claimed, it being understoodthat changes in the precise embodiment of the 2@ invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

Several practical embodiments of the invention are illustrated in the accompanyin@ drawings, wherein:

Fig. 1 is a more or less diagrammatic plan view partly in section, showing a system of gearing including the preferred embodiment of the invention;

Fig. 2 is a detail sectional View taken on the line 2--2 of Fig. 1;

Fig. 3 is a view similar to Fig. 1 withthe toggle mechanism in a different position;

Fig. 4f is a sectional view taken on t-he line Z1--4. of Fig. l;

Fig. 5 is a view in elevation of an alternate means for driving the pinion shafts of Fig. 1 and taken on the line 5 5 of Fig. 8;

Fig. 6 is a fragmentary view in side elevation showing the application of the invention to a split gear;

Fig. 7 is a detail sectional view on the line 7'-7 of Fig. 6;

Figs. 8 and 9 are views, respectively, in plan and side elevation illustrating the application of the invention to a translating screw mechanism.

Referring to the drawings by numerals of reference: f

The gear system shownin Figs. 1 and 2y kpinion shafts 8.

disposed in the plane of thedriven gear 5.

comprises generally a driven gear 5, duplicate 'driving pinions 6` and actuating mechanism 7` for imparting rotation to the parallel `Each ofthe shafts 8 is mounted in bearings 9 and 10.

The outer end of each of the shafts is -mountedthrough a bearing'll in the eXtremity of links 12 which are connected centrally vby a pin 13 to provide a toggle mechanism The pin 13 is on a hollow crosshead 14; fit# ting 1n a cylindrical bearing 15 in the bracket and confining a helical spring 16. The

v`outer ends of the links 12 are each formed witha slot 17 for mounting on a pin 18 in the bracket.

p ln Fig. 6 the principles of the invention are illustrated in its application to a split gear. The split gear is made in two parts one part Y 23 keyed as at 24 to the sha-ft 25 and the other part 26 journaledon the shaft. One of Vthe toggle links 27 is pivoted to the fixed gear 23 and the other to vthe free gear 26. A spring 28 adjustably connected to one ofthe gears may supplyr the pressure medium for actuating the ltoggle to displace the free gear and take up the clearance between the gear and pinion 29. y

In Fig. 8 the invent-ion is applied to a gear in which the screw 30k is to move the carriage 51.v The gearing on the carriage consists of a fixed butt 32 and a displaceable nut 33 which is keyed to the carriage as at 84 to restrain K it against rotation. The links 35 of the toggle are connected to each of the nuts and because one of these nuts is fixed the ycrosshead 36 on the joint 37 of the toggle must be arranged for lateral displacement as indicated by the clearance at 38. y

The operation of the modified forms ofthe invention in their different applications is the same as that described in connection with Figs. 1 and 2.

The action of the spring 16 in tending to straighten out the toggle j oint imparts aflat eral displacement to the pinion shafts,v preferably through iienure of the shafts, which is converted into a rotary movement of the shafts by virtue of the pinions which are thus caused to revolve about the periphery fof the ,gear Rotation of the-.pinions i i hediscontinuedwhen all clearance is` takenVV up between the teethV inthe actuatingrmech anism and, as will be apparent from Fig. 2,1 thererwill also -ljie no clearance between the teeth of the pinion and the gear.` Further more, the duplication of the pinions and the `consequent duplication of the actuating mechanism will insure a positive engagement in which the gearing 5 is to he rotated and Y I ing the transition.

of these` partsjirrespective of the direction there will he no lost motion in` accomplish- VThe arrangement shownin Fig. 3 is similartothat shown in Fig. 1 except that the toggle mechanism is positionedadjacent the 'A y aetuating mechanism 7 and the hearings are arranged to allow for lateral movement of theV pinionshafts. i The .actuating mechanism in this instance consists of a worm 20 and Worm i wheel 21. i V

n InFig. .4 an alternate form of actuating mechanism is shown injwhich the'pinion is g Y oi `c`e`nter.,r The toggle .mechanism `associ- `of`actuatingjinechanisnfi would Vhe made to y,

draw the pinion shafts 8, together instead of y ated inthefinanner of Fig. 3 with this type spreading them.

:I Claim; A Y p l. In a gear system, pinions meshinglwith said gear, shafts on which the, pinions are carried, actuating mechanismmfor saidfpinion shafts, a toggle mechanism havingits linksconnected to the pinion shafts, and` means'foractuating thev toggle'to Aimpart a `bodily displacement to the pinion shafts. i

2. In a gear system, a drivenl gear, spaced pinions `meshing with said gear, parallel shafts on which the pinions are carried, actuating mechanism for saidpinion shafts and means tending to move the shafts out of par-v allelism.

. 3. VIn a gear system, a driven gear, spaced l pinioiismeshing with said gear, `shafts on Y which thel pinions are carried, actuating mechanism for said pinion shafts and means Vil' ` shaft or shafts.

tending to `impart bodily displacement to a .WALTER iiiiofrnn.

adriven'v gear, spaced j 

